Network Architecture

Network Architecture
 
Provides a general, effective, fair, and robust connectivity of computers 
Provides a blueprint
Types
OSI Architecture
Internet Architecture 
oSI ARCHITECTURE
 
Open Systems Interconnection (OSI) model is a reference model developed by ISO (International Organization for Standardization) in 1984
  OSI model defines the communications process into  Layers 
Provides a  standards for communication in the network 
Primary architectural model for inter-computing and Inter networking communications. 
network communication protocols  have a structure based on OSI Model
 

 
Internet Architecture
TCP/IP Architecture
Four Layer model
TCP,UDP,FTP,HTTP,SMTP Protocols  used
Internet Protocol Graph
Direct Links: Outline 
Physical Layer
Link technologies
Encoding
Link Layer
Framing
Error Detection
Reliable Transmission (ARQ protocols)
Medium Access Control:
Existing protocols: Ethernet, Token Rings, Wireless
Link Technologies
Cables:
Cat 5 twisted pair, 10-100Mbps, 100m
Thin-net coax, 10-100Mbps, 200m
Thick-net coax, 10-100Mbps, 500m
Fiber, 100Mbps-2.4Gbps, 2-40km
Leased Lines:
Copper based: T1 (1.544Mbps), T3 (44.736Mbps)
Optical fiber: STS-1 (51.84Mbps), STS-N (N*51.84Mbps

pLast-Mile Links:
POTS (56Kbps), ISDN (2*64Kbps)
xDSL: ADSL (16-640Kbps, 1.554-8.448Mbps), VDSL (12.96Mbps-55.2Mbps)
CATV: 40Mbps downstream, 20Mbps upstream
Wireless Links: Cellular, Satellite, Wireless Local Loop

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